The CSDZ-20H-1.6G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1350 to 1850 MHz, Coupling 20 dB, Coupling Variation ±0.6 dB, Frequency Sensitivity ±0.40 dB, Directivity 15 dB. Tags: Surface Mount. More details for CSDZ-20H-1.6G can be seen below.